SuperPro SPF0521-23K 23mm Sway Bar Mount Bushing KitSuperPro SPF0521 23K 23mm Sway Bar Mount Bushing Kit Sway bar mount bushings are one of the most underappreciated components in your suspension system. Responsible for anchoring the sway bars and facilitating proper function and body control of your vehicle the OEM rubber bushings are tasked with quite a job and in turn wear quickly compromising the effectiveness of your sway bar and contributing to a loose, sloppy feeling on the road over time.